Micrometer-feed for tools.



B. D. JACKSON.

MIGROMETBR FEED POR TOOLS.

APPLICATION FILED NOV. 7,1912.

1,084,014, Patented Ja11.13, 1914.

UNITED STATES PATENI OFFICE.

BYRON D. JAcKsoN, o ERIE, PENNSYLVANIA, AssIGNOE To MODERN rroOLr COMPANY, OE ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

MICROMETER-FEED FOR TOOLS.

To all lwhom it may concern:

Be it known that I, BYRON D. JACKSON, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful Improvements in lVIicrometer-Feeds for Tools, of which the following is a specification.

This invention relatesto micrometer fee'ds for tools and consists in certain improvements in the construction thereofas will behereinafter fully described and pointed out in the claims.

The invention is particularly designed for use on grinding machines and as shown is arranged in connection with the cross feed shaft of a grinding machine. I

The Object of the device is to provide an automatic feed which may be adjusted with minute variations to adapt the device to varying classes of work.

The invention is illustrated in the accompanying drawings as follows Figure 1 shows a plan view of the device. Fig. 2 a vertical section on the line 2 2 in Fig. 1. Figs. 3, et and 5 details of the pawl actuating mechanism, the three gures showing three different adjustments of this mechanism. l

1 marks the carriage. 1a the frame on which the carriage operates. These are of any ordinary construction. The carriage is provided with the adjustable carriage stops 2 and 3. These operate on the reversing lever 4, the reversing lever being fixed on the reversing shaft 5. The reversing' mechanism is notshown. It will be understood that any of the ordinary reversing mechanisms may be used. The feed shaft 6 is journaled in the frame 1a and is connected with the cross feed by any of the well-known mechanisms suitable to be actuated by the feed shaft. The feed ratchet wheel 7 is fixed on the shaft 6 anda hand wheel 8 is also fixed on this shaft. Both the devices, the ratchet wheel and the hand wheel are of a construction now in use.

The pawl lever 9 is pivoted by means of a pin 10 onthe frame la. It carries the feed pawl 11. It is adapted to operate on the ratchet wheel 7 The pawl is swingingly mounted on the lever 9 by means of a pin 12. The pawl is yieldingly pressed into engagement-with the wheel 7 by means of a spring 13, the spring pressing on a small lpointed Specification of Letters Patent.

Patented J an. 13, 1914.

Application led November 7, 1912. Serial No. 730,095.

arm 14. When the spring is arranged on the top of this arm the pawl is forced into `l'engaugeinent with the teeth 15Of the wheel but the pawl ma y be drawn out against the force of this spring and the point drawn back of the downward extension 16 on the spring and in this way the pawl may be locked Outof position to engage the teeth.

A double cam commonly called an arrow point 17 is arranged on the pawl lever 9, and a swinging lever 18 operates on this arrow point 17 to actuate the pawl lever 9. The lever 18 is pivoted on the pin 19, the pin extending into the frame 1a and is provided with the roller 20 to facilitate its action on the cam surfaces of the arrow point 17. It will be noted that as the lever 18 is oscillated' a complete movement of the pawl lever is accomplished with a movement of the oscillating lever 18 in either direction. The oscillating lever 18 is connected to a link 21 by a pin 22 and the link 21 is connected to the reversing lever 4 by a pin'23. In this manner it will be observed that with each movement of the reversing lever the oscillating lever 18 is moved.

It is sometimes desirable to have a feeding action at each end of the movement of the carriage. At other times it is desirable to have the feeding action only at one end and also desirable to be able to control the end at which the feeding action takes place. This is accomplished in this mechanism as follows A filling piece 24 is mounted on the pawl lever 9 by means of a pin 25. This filling piece has the surface 26,' the surface when swung into the position shown in Figs. Lt and 5 being an arc of a circle with the axis of the oscillating lever as a center. Therefore, when this filling piece is thrown into the position shown in Figs. 1 and 5, the

movement of the lever 18 over the surface 26 doe's not effect the movement of the pawl lever. piece 24 is 'thrown Out of the position on the cam surface of the arrow pO-int v17 as'shown in Fig. 3 the roller 20 will follow down the cam surface of the arrowjpoint and will effect a movement of the pawl lever. A filling piece 27 is mounted on a pin 28 on the pawl lever and has the surface 29 which is similar to the surface 26. This filling piece 27 iwhen thrown to the position shown in- Figs. 8 and 4 will prevent amovement of the pawl lever by reason ofthe movement of the oscillating lever 18 "on that side of the arrow point. On the other hand, if'this filling piece 9T is thrown to the position shown in Fig. 5 thenv the oscillating lever will follow down the cam surface and effect a movement of the pawl lever. rlhus, it will bjc seen that with the filling pieces as shown in Fig.l 3 there will be a movement at one end of the carriage. IVith the filling pieces as sho-wn in Fig. 4: there iwill be no feeding movers ent. With the filling pieces as shown in Fig. 5 there will be a movelnent at the opposite end of the carriagefrom that shown in Fig. 3. IVith both the filling pieces thrown back as shownjn Fig. 2 there will be a feeding movement with a. reversing movement at each end of the carriage. It is also desirable to control the amount of feed with each'operation of the feed wheel.

' oaccomplish this I have provided the following mechanism zlever 30 Ais pivoted on the feed shaft (3. It has the circumferential slot 31 in its outer end through which extends a screw The purpose of the screw is to lock the` lever in different positions of adjustment. I prefer also to pro, vide an adjustable plate 'with a series of perforations 33 which are traversed by t-he end of the lever 30. The pin 3l is slidingly mounted in the end of the lever 30 and is adapted to enter the perforations The pin 34 is provided with the knob so that it may be readily actuated. With these two devices, that is, the screw 32 and the pin 34, `the lever 30 may be more readily and quickly varied in its position. A pawl plate 3G is carried -by the lever 30. When the lever is in its upper position as shown in Fig. 2, this pawl plate just clears the pawl ll wit-h the pawl lever in its upper position but as the lever 30 is lowered carrying the pawl plate 36 downwardly the pawl plate is Carriedv into the path of the pawl l1 as it moves upwardly and, therefore, the pawl in t-he upper part of its travel will slide on the pawl plate 36. On the downward or feeding movement of the pawl lever a part of this movement is taken up by this sliding movement of the pawl on the pawl plate and thus the effective movement of the pawl is to that extent reduced. With the pawl plate in its j extreme lower position the pawl is. retained out of position to engage the teeth throughout its entire tra-vel. It will be readily seen that by adjusting the lever 30 to the vario-us intermediate positions the amount of feed.

may be accurately adjusted. It is also desirable in devices of this kind to provide an automaticy means for throwing out the feeding mechanism at a pre-determined point so that a number of pieces may be automatically ground to size. I have provided the mechanism for accomplishing this as fol? lows :Mein arm 37 is arranged on the shaft 6 between the wheels 7 and 8. It is provided lwitli it lhe lockout plaie 3S) are set lo the dcsired point lo give to the wheel T the amount of feed desired. \Vhen the lockout plate 39 reaches the position traversed by the pawl 1l it ,swings in between the pawl and the` wheel and thus prevents the pawl engaging 'with the feed wheel. This action on the pawl is a gradual one reducing the last few feeds until it is.finally thrown out. This is desirable in that it is zulvanlageous to have the finis-hing cuts of the grinding operation slightly reduced so as to get exactness of operation.

W' hat I claim as new is l. In a micrometer feed for tools, thecombination of a feed shaft; a ratchet. wheel on the shaft; a pawl operating on the ratchet wheel to effect the feed; an arrow point cam for actuating the pawl; a lool carriage; a reciprocating part actuated by the carriage and operating on said arrow point cam for actuatingthe pawl; and devices forthrowin out of action one of the cam surfaces of the arrow point cam. f

In a micrometer feed for tools, the combination of a feed shaft; a ratchet wheel on the'sha-ft;'a pawl operating on the ratchet wheel to effect the feed; an arrow point cam for actuating the pawl; a tool carriage; a reciprocating part actuated by the carriage and operating normally on the arrow point cam for actuating the pawl; and a swinging filling piece adapted to be `thrown 'over' one surface of the arrow point cam and having a surfacei'coinciding with the path of movement of the reciprocating part.

3. In a micrometer feed for tools, the combination of a feed shaft; a yratchet wheel on the shaft; a pawl lever; an larrow point cam on the pawl lever; an oscillating lever operating on the arrow point cam; means for actuating the oscillating lever from the carriage; filling pieces adapted to be swung over the cam surfaces of t-he arrow point cam, said filling pieces having surfaces in the form of arcs of circles withthe axis of the oscillating lever as a center; and a pawl carried by the pawl lever and operating on the ratchet Wheel. V

4. In a micrometer feed for tools, the combination of a feed shaft; a ratchet wheel on the shaft; a ratchet pawl operating on said wheel; means for actuating the pawl; a normally stationary pawl plate arrangedin the Y to vary the action of the pawl on. the w eel.

. 5. ln a micrometer feed for tools, the com- `hination of a feed shaft; a ratchet wheel on the shaft; a. ratchet paWl operating on said wheel; means for actuating the pawlv; a normally stationarypawl plate arranged in the f path of the pawl to limit: its action onthe wheel; a lever carrying' the plate journaled Ywith the axis of the feed shaft as an axis; 'and means for adyusting the lever to different positionto adjust-the pawl plate.

G. In a micrometer yfeed for tools, the com lnnation of afeedfslaft; a ratchet` Wheel on the-shaft; a. ratchet pawl operating on said wheel; means' for actuating the p-a wl; a normally stationary paWl plate adapted to be thrown into the path of the paWl to limitf its action on the wheel; a lever carrying the plate journaled with the axis of the feed shaft as an axis; and an adjusting device for the lever comprising a perforated plate and a. pin carried by the lever adapted to op.- erate in connection with the perforated plate to lock the lever in various positions.

7. In a micrometer feed fortools, thecombination of a feed shaft; a ratchet wheel on the shaft a ratchet pavvl operating on said Wheel means for actuating` the pawl; a normally stationary pawl plate adapted to be thrown into the path of the paw] to limit its action travel with the Aratchet wheell and adapted to. lockrthe paWl out of action at a pre-determined `point in the travel of the ratchet Wheel. 8. In a micrometer feed for tools, the combination of a feed shaft; a ratchet Wheel on the shaft; a ratchet pawl operating on said wheel; lneans for actuating the aWl; a nor# rmally stationary paWl plate a apt-ed to be thrown into the path of the pawl to limit its action on the Wheel; means for adjusting the plate to vary the action of the pawl on the wheel; and a lockout lplate adjustably mounted `to travel with the ratchet wheel and adapted to lock the pawl out of action at a pre-determined point inv the travel of the ratchet wheel, saidxlockout plate and pawl plate extending over a part of the vsurface of the ratchet wheel to permit the passage of the lockout plate past the paWl `ilate. 1 In testimony whereof I have hereunto set my hand in the presence of two subscribing 3 Witnesses.

BYRON D. JACKSON.

Witnesses i v B. M. HARTMAN,

H. C. Loan 'on the Wheel; means for adjusting the late lto vary the action of the`pawl on the w ieel;

and a lock-out plate adjustably mounted t'b 

